▎ 摘　　要

In this work, we propose and simulate a scheme model about a single-graphene-nanoribbon (GNR) emitter embedded into a microcavity to investigate the photon properties and lasing action using a fully-quantum-mechanical treatment model with the excitonic interaction included. When the single armchair-edged GNRs (AGNRs) microcavity system is pumped, the exciton-photon coupling due to Purcell effect provides more photons and enhances the photon emission process, making it essentially a lasing object. Our theoretical results demonstrated that single AGNR in a semiconductor microcavity system can serve as a nanolaser with ultralow lasing threshold. Our study here has established a useful theoretical model and also guideline for further fabrication of GNR-based optoelectronic nanodevices.